propagate_positions: Bugfix + Better documentation

[erezsh]

Addresses issue #1293

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (623f04d) 89.22% compared to head (87d531a) 89.22%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1294   +/-   ##
=======================================
  Coverage   89.22%   89.22%           
=======================================
  Files          51       51           
  Lines        7593     7595    +2     
=======================================
+ Hits         6775     6777    +2     
  Misses        818      818           

Flag	Coverage Δ
unittests	89.22% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
lark/lark.py	85.84% <ø> (ø)
lark/tree.py	68.08% <ø> (ø)
lark/parse_tree_builder.py	96.42% <100.00%> (+0.03%)	⬆️

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